Bob Dylan’s first fully fledged electric album engendered considerable controversy. Folk purists had already waved goodbye to him, but rock had become the métier through which the singer could now best express his vision. Session organist Al Kooper and blues guitarist Mike Bloomfield were among those providing free-spirited accompaniment to a collection of songs that redefined pop music. Wrapped in a raw, driving sound, Dylan’s poems - part beat, part symbolist, part concrete - ensured that contemporaries could no longer rely on traditional forms, an influence immediately apparent on recordings by the Beatles and the Rolling Stones. There are lyrics of a generation still to be found on this album, only now can we really understand them; ‘do you Mr Jones?’...